Why does Android WebView reset JavaScript context on second page load?
Question
I am using an Android WebView with local data by first setting up a JavaScript environment and then loading web content that relies on the existence of the JavaScript environment:
test.js:
alert("test.js: type of window.myVar is: " + (typeof window.myVar));
window.myVar = {};
test.html:
<!DOCTYPE>
<html><head>
<script>
alert("test.html: type of window.myVar is: " + (typeof window.myVar));
</script>
</head><body></body></html>
loading procedure in Java:
private void loadData() {
_webView.loadUrl("javascript:" + testJSContent);
_webView.loadDataWithBaseURL(null, testHTMLContent, "text/html", "utf-8", null);
}
The first time loadData() is triggered, window.myVar is available from the loaded HTML page, but undefined on any subsequent tries. Here is the alert output on three invokations:
-> loadData() called
"test.js: type of window.myVar is: undefined"
"test.html: type of window.myVar is: object"
-> loadData() called
"test.js: type of window.myVar is: object"
"test.html: type of window.myVar is: undefined"
-> loadData() called
"test.js: type of window.myVar is: undefined"
"test.html: type of window.myVar is: undefined"
Any ideas why the JavaScript object created by injection is only persistent until the second page load?
Thanks for any help!
1 answers
solution1
0 2013-03-15 22:28:28
You should first load the html and after that page has fully loaded inject the javascript. Do it in OnPageFinished of the WebViewClient.
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